The source provides the following information about the methodology: "The WARC Effective 100 is a ranking of the world’s most awarded campaigns and companies for effectiveness. It compiles the results of award shows that ran the year prior to its publication (e.g. the 2026 rankings reflect the results of award shows that ran in 2025)."
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WARC. (March 8, 2026). Most effective advertisers in the United Kingdom (UK) in 2025 (index score) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/517769/best-advertisers-in-the-uk/
WARC. "Most effective advertisers in the United Kingdom (UK) in 2025 (index score)." Chart. March 8, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/517769/best-advertisers-in-the-uk/
WARC. (2026). Most effective advertisers in the United Kingdom (UK) in 2025 (index score). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/517769/best-advertisers-in-the-uk/
WARC. "Most Effective Advertisers in The United Kingdom (Uk) in 2025 (Index Score)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 8 Mar 2026, /statistics/517769/best-advertisers-in-the-uk/
WARC, Most effective advertisers in the United Kingdom (UK) in 2025 (index score) ÌÇÐÄÆƽâ°æ, /statistics/517769/best-advertisers-in-the-uk/ (last visited July 24, 2026)
Most effective advertisers in the United Kingdom (UK) in 2025 (index score) [Graph], WARC, March 8, 2026. [Online]. Available: /statistics/517769/best-advertisers-in-the-uk/
